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Hereis a Department of Defense site on the military’s research on transcranial direct current stimulation:

“tDCS works by passing a small current using twenty-two electrodes placed on your body (with at least one on your head). The idea here is that, because your brain runs on electricity passing the electrical current through, the tDCS should change the way the brain works, allowing you to affect behavior.”

Not much new here, except for the fact that the DOD is taking this research very seriously.

Not related to the DOD research here is video about tDCS research at the University of Essex.